MAGNETIC MAP of the NORTHERN TERRITORY AIRBORNE SURVEY SPECIFICATIONS MELVILLE ISLAND CAPE DON ARAFURA SEA WESSEL ISLANDS TIMOR SEA BATHURST VAN DIEMEN GULF ISLAND BEAGLE 132°E 135°E GULF 129°E 138°E GULF OF JUNCTION BAY MELVILLE ISLAND COBOURG PENINSULA WESSEL ISLANDS TRUANT ISLAND BATHURST ISLAND PERON ISLANDS CARPENTARIA JOSEPH MELVILLE BONAPARTE GROOTE ISLAND EYLAN CAPE GULF DT DON ARAFURA SEA WESSEL ISLANDS TIMOR MARIA ISLAND SIR EDWARD PELLEW GROUP SEA Airborne Survey BATHURST VAN DIEMEN GULF ISLAND Flight Line Spacing (m) MILINGIMBI 12°S DARWIN ALLIGATOR RIVER ARNHEM BAY GOVE 12°S FOG BAY BEAGLE 150 GULF DARWIN GULF 200 250 OF 300 400 MOUNT MARUMBA PINE CREEK MOUNT EVELYN BLUE MUD BAY PORT LANGDON CAPE SCOTT 500 PERON ISLANDS CARPENTARIA > 500 JOSEPH BONAPARTE GROOTE GULF EYLANDT URAPUNGA FERGUSSON RIVER KATHERINE ROPER RIVER CAPE BEATRICE The quality of the data used to PORT KEATS construct the magnetic image is a function of the flight line spacing, along line sampling, flying height and positional accuracy. KATHERINE The predominant regional-scale line spacing of magnetic data included in the Magnetic Map of the Northern Territory is shown here. Some smaller high MARIA ISLAND resolution surveys are included in HODGSON DOWNS this merge; these are not 15°S DELAMERE LARRIMAH MOUNT YOUNG PELLEW 15°S AUVERGNE displayed. 0 100 200 300 400 500 km SIR EDWARD PELLEW GROUP GEOLOGICAL REGIONS TANUMBIRINI VICTORIA RIVER DOWNS DALY WATERS BAUHINIA DOWNS ROBINSON RIVER WATERLOO Mesozoic-Cenozoic Neoproterozoic- Palaeozoic BEETALOO WAVE HILL NEWCASTLE WATERS WALHALLOW CALVERT HILLS Palaeo-Mesoproterozoic LIMBUNYA Basins Palaeo-Mesoproterozoic Orogens Archaean The Northern Territory is dominated by Palaeo- to HELEN SPRINGS 18°S WINNECKE CREEK SOUTH LAKE WOODS BRUNETTE DOWNS MOUNT DRUMMOND 18°S Mesoproterozoic orogens and BIRRINDUDU basins, with localised outcrop of Neoarchean (2.7-2.5 Ga) granite and gneiss. Palaeoproterozoic orogens form widespread and prospective basement (eg Pine Creek Orogen, Aileron Province, Tanami Region, Tennant Region), with protolith ages most commonly in the range 1.87-1.73 Ga. Further south, the Warumpi and Musgrave provinces represent more juvenile crust with ages of 1.69-1.07 Ga. TENNANT CREEK TANAMI EAST GREEN SWAMP WELL ALROY RANKEN TANAMI Widespread Palaeo- Mesoproterozoic basins (McArthur, Tomkinson, Birrindudu and South Nicholson basins) overlie much of the North Australian Craton and are connected beneath younger TENNANT CREEK basins. The Neoproterozoic to Palaeozoic basins were linked for much of their history, but were substantially affected and dismembered by intraplate BONNEY WELL MOUNT SOLITAIRE LANDER RIVER FREW RIVER AVON DOWNS tectonics in central Australia. The THE GRANITES Kalkarindji Province records a widespread Cambrian flood basalt event over much of the northern part of the Territory. Mesozoic to Cenozoic basins form widespread cover successions and are QUEENSLAND relatively undeformed. WESTERN AUSTRALIA WESTERN 0 100 200 300 400 500 km BARROW CREEK 21°S MOUNT THEO MOUNT PEAKE ELKEDRA SANDOVER RIVER 21°S HIGHLAND ROCKS TOTAL MAGNETIC INTENSITY 1VD MELVILLE ISLAND CAPE DON ARAFURA SEA WESSEL ISLANDS TIMOR SEA BATHURST VAN DIEMEN GULF ISLAND BEAGLE GULF GULF ALCOOTA MOUNT DOREEN NAPPERBY HUCKITTA TOBERMOREY OF LAKE MACKAY PERON ISLANDS CARPENTARIA JOSEPH BONAPARTE GROOTE GULF EYLANDT MARIA ISLAND SIR EDWARD PELLEW GROUP ALICE SPRINGS MOUNT LIEBIG HERMANNSBURG ILLOGWA CREEK HAY RIVER MOUNT RENNIE ALICE SPRINGS RODINGA 24°S LAKE AMADEUS HENBURY HALE RIVER SIMPSON DESERT NORTH 24°S BLOODS RANGE FINKE AYERS ROCK KULGERA McDILLS SIMPSON DESERT SOUTH PETERMANN RANGES First vertical derivetive of the 26°S 132°E 135°E 26°S 129°E SOUTH AUSTRALIA 138°E reduced to pole Total Magnetic Intensity of the Northern Territory. 0 100 200 300 400 500 km 50 0 50 100 150 200 250 km Albers Equal Area Projection 6500 Central Meridian 133°30' EAST Standard Parallels 13°30' and 23°30' SOUTH TOPOGRAPHIC SYMBOLS Geocentric Datum of Australia 1994 (GDA94) 350 Department of Primary Industry and Resourses Main road NORTHERN TERRITORY GEOLOGICAL SURVEY Compiled: T Dhu 2020 Ian Scrimgeour, Executive Director This map displays reduced-to-pole Total Magnetic Intensity (TMI) grid for the Northern Territory. 90 Secondary road The grid is derived from a compilation of airborne magnetic surveys acquired by NTGS, Geoscience Australia and the private sector since the mid 1960’s.The data is gridded at 80m cell size. nT Data from the NTGS Tanami Region Airborne Magnetic and Radiometric Survey and NTGS Mount Peake - Crawford Airborne Magnetic and Radiometric Survey have been added since the 2016 edition. Railway 0 Cartography: IM Burgan and NJ Saunders Locality © Northern Territory of Australia (NT Geological Survey) 2020 Produced by the Northern Territory Geological Survey, Department of Primary Industry and Resources, Darwin, Australia. -90 1:250 000 geological map sheet Issued under the authority of the Minister for Primary Industry and Resources, the Honourable PAUL KIRBY, MLA. SIMPSON DESERT SOUTH With the exception of the Northern Territory of Australia logo and where otherwise noted, all material This map is available from http://www.geoscience.nt.gov.au/gemis/ or by emailing [email protected] on this publication is provided under a Creative Commons Attribution 4.0 International licence. -4770 https://creativecommons.org/licenses/by/4.0/legalcode The recommended reference for this map is: Dhu T (compiler), 2020. Magnetic Map of the Northern Territory, 1:2 500 000 scale. Northern Territory Geological Survey, Darwin. WARNING: Colours will fade with prolonged exposure to light.